Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 83)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 83
Component Definition and Maintenance Chapter 3
Checking Clamping Pressure
Periodically, the clamping force in the PowerCage should be inspected. Ensure
there is no power to the equipment.
Figure 71 - Clamp Head Illustration
If proper force (as designated on the clamp head block) is applied to the clamping
assembly, the indicating washer should just be able to rotate with fingertip touch.
The indicating washer should not rotate freely. Some force will need to be
applied with your fingertips.
Clamping Pressure Adjustment
1. Ensure that all power to the drive is off.
2. Do not loosen the adjustment nut. If the clamping pressure is let off, the
assembly procedure must be carried out to ensure uniform pressure on the
thyristors.
3. Tighten with a 21 mm wrench on the adjustment nut (upward motion)
until the indicating washer can be turned by fingers with some resistance.
IT SHOULD NOT SPIN FREELY
.
ATTENTION: Main power must be disconnected before working on the drive.
Verify that all circuits are voltage free using a hot stick or appropriate voltage-
measuring device. Failure to do so may result in injury or death.
IMPORTANT Never rotate the calibration nut located outside the indicating washer at the
end of the threaded rod. The rotation of the outer nut will affect the torque
calibration, which is factory set. Only adjust the inside nut (see
Figure 71 and
Figure ).
Calibration nut – DO NOT ADJUST
Indicating washer
Clamp bar
Adjustment nut
Disc springs
Pressure pad face